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ATMEGA8L-8AU Datasheet(PDF) 42 Page - ATMEL Corporation |
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ATMEGA8L-8AU Datasheet(HTML) 42 Page - ATMEL Corporation |
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42 / 331 page  42 2486AA–AVR–02/2013 ATmega8(L) Internal Voltage Reference ATmega8 features an internal bandgap reference. This reference is used for Brown-out Detec- tion, and it can be used as an input to the Analog Comparator or the ADC. The 2.56V reference to the ADC is generated from the internal bandgap reference. Voltage Reference Enable Signals and Start-up Time The voltage reference has a start-up time that may influence the way it should be used. The start-up time is given in Table 16. To save power, the reference is not always turned on. The ref- erence is on during the following situations: 1. When the BOD is enabled (by programming the BODEN Fuse) 2. When the bandgap reference is connected to the Analog Comparator (by setting the ACBG bit in ACSR) 3. When the ADC is enabled Thus, when the BOD is not enabled, after setting the ACBG bit or enabling the ADC, the user must always allow the reference to start up before the output from the Analog Comparator or ADC is used. To reduce power consumption in Power-down mode, the user can avoid the three conditions above to ensure that the reference is turned off before entering Power-down mode. Table 16. Internal Voltage Reference Characteristics Symbol Parameter Min Typ Max Units VBG Bandgap reference voltage 1.15 1.30 1.40 V tBG Bandgap reference start-up time 40 70 µs IBG Bandgap reference current consumption 10 µA |
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